On 2022-06-16 12:41:27 [-0700], Andrew Morton wrote: > ------------------------------------------------------ > From: Chen Jun <chenjun102@xxxxxxxxxx> > Subject: lockdep: make PROVE_RAW_LOCK_NESTING depend on PREEMPT_RT > Date: Thu, 16 Jun 2022 02:29:11 +0000 > > CONFIG_PROVE_RAW_LOCK_NESTING is used to check two things. > 1. calling spin_lock in hardirq. > 2. raw_spinlock - spinlock nesting. > The error messages like below: > [ 13.485711] [ BUG: Invalid wait context ] > > However there is no problem on non-PREEMPT_RT kernel. The messages may be > confusing and disturbing. > > Therefore, do not check raw_spinlock - spinlock nesting > on non-PREEMPT_RT kernel. This is not correct. The annotation is used to detect problems on non-PREEMPT_RT kernels which occur on PREEMPT_RT. This is documented in Kconfig. Letting this option depend on PREEMPT_RT renders it pointless because warning are spit on PREEMPT_RT even without that option enabled. Please drop that patch. > Link: https://lkml.kernel.org/r/20220616022911.35826-1-chenjun102@xxxxxxxxxx > Signed-off-by: Chen Jun <chenjun102@xxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> > Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Sebastian
